Hi, This my **guess**. In the constructor
AxisAngle4d(double x, double y, double z, double angle) (x,y,z) seem to be coordinates of a point. If there is an origin (0,0,0), then the axis of rotation is that defined by the line from (0,0,0) to (x,y,z). For example, AxisAngle4d(0, 0, 1, angle) will make it rotate about the z-axis. I would also *guess* that the sense of rotation would vary according to the sign of the angle. Let me know if it works svp. Alejandro >-----Original Message----- >From: Discussion list for Java 3D API >[mailto:[EMAIL PROTECTED]]On Behalf Of cyrene lee >Sent: Saturday, October 05, 2002 11:16 PM >To: [EMAIL PROTECTED] >Subject: [JAVA3D] AxisAngle4f and rotations > > >Hi, > >I'm still trying to figure out the last argument of axisangle4f. > >eg for AxisAngle4d(x,y,z,angle) > >the manual says that the angle is the rotation angle about the vector >(x,y,z) - which way? > >Reading the the answers from the forum regarding axisangle4f, it seems that >it rotates about the local y-axis. Does that mean that for the example >above, y is taken as the y-axis in this rotation? > >I've also read that if a rotation abt the local z-axis (I'm assuming it'll >be z in the above case) is required, the local y-axis has to be rotated -90 >abt the local x-axis - but if the rotation is always done abt the local >y-axis, how can you get the local y-axis to rotate about the local x-axis? > >on another note, is there any lib function that can take an initial point, >end point and a pivot point and return the required rotation >required to map >the initial point onto the end point by rotating abt the pivot point? > >Please help. > >Thanks >Cyrene > > > > >_________________________________________________________________ >Chat with friends online, try MSN Messenger: http://messenger.msn.com > >=========================================================================== >To unsubscribe, send email to [EMAIL PROTECTED] and include in the body >of the message "signoff JAVA3D-INTEREST". For general help, send email to >[EMAIL PROTECTED] and include in the body of the message "help". =========================================================================== To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA3D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
